<template>
	<view>
		<!-- 自定义的搜索组件 -->
		<my-search @click="mysearchHandler"></my-search>
		<view class="scroll-view-container">
			<!-- 左侧的滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
				<block v-for="(item, i) in cateList" :key="i">
					<view @click="activeChanged(i)" :class="['left-scroll-view-item', i === active ? 'active' : '']">{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<!-- 右侧的滑动区域 -->
			<scroll-view scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
					<!-- 二级分类标题 -->
					<view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
					<!-- 二级分类下的三级分类列表 -->
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" @click="gotoGoodsList(item3)" v-for="(item3, i3) in item2.children" :key="i3">
							<image :src="item3.cat_icon"></image>
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins: [badgeMix],
		data() {
			return {
				// 当前设备的可用高度
				wh: 0,
				cateList: [],
				active: 0,
				// 二级分类数组
				cateLevel2: [],
				// 距离屏幕顶部的距离
				scrollTop: 0
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			// console.log(sysInfo);
			this.wh = sysInfo.windowHeight - 50
			this.getCateList()
		},
		methods: {
			async getCateList() {
				const {data: res} = await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message
				this.cateLevel2 = res.message[0].children
			},
			activeChanged(i) {
				this.active = i
				// 重新为二级分类赋值
				this.cateLevel2 = this.cateList[i].children
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			// 跳转到商品列表页面
			gotoGoodsList(item) {
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid=' + item.cat_id
				})
			},
			mysearchHandler() {
				uni.navigateTo({
					url: '/subpkg/search/search'
				})
			}
		}
		
	}
</script>

<style lang="scss">
.scroll-view-container {
	display: flex;
	.left-scroll-view {
		width: 120px;
	}
	.left-scroll-view-item {
		background-color: #F7F7F7;
		line-height: 60px;
		text-align: center;
		font-size: 12px;
		&.active {
			background-color: #fff;
			position: relative;
			&::before {
				content: ' ';
				display: block;
				width: 3px;
				height: 30px;
				background-color: #c00000;
				position: absolute;
				top: 50%;
				left: 0;
				transform: translateY(-50%);
			}
		}
	}
}
.cate-lv2-title {
	font-size: 12px;
	font-weight: bold;
	text-align: center;
	padding: 15px 0;
}
.cate-lv3-list {
	display: flex;
	flex-wrap: wrap;
	.cate-lv3-item {
		width: 33.33%;
		display: flex;
		flex-direction: column;
		justify-content: center;
		align-items: center;
		margin-bottom: 10px;
		image {
			width: 60px;
			height: 60px;
		}
		text {
			font-size: 12px;
		}
	}
}
</style>
